package com.wc.alorithm_luogu._简单题.B2029;

import java.util.Scanner;

/**
 * @Author congge
 * @Date 2023/4/17 19:19
 * @description https://www.luogu.com.cn/problem/B2029
 * 大象喝水
 */
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int h = sc.nextInt();
        int r = sc.nextInt();

        double S = h * r * r * 3.14;
        int ans = (int) (20000 % S == 0 ? 20000 / S : 20000 / S + 1);

        System.out.println(ans);
    }
}
